Everything except 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42 and 84.
3 is a factor of 84.
The greatest factor of any number is itself.
4 is the only square number that is a factor of 84. No square number is a factor of 105.
7,3,2,2 21,2,2 42,2 84
The factors of 84 are 1,2,3,4,6,7,12,14,21,28,42 and 84. To find a greatest common factor, you need to compare them to another number's factors.
The highest common factor of 60 and 84 is 12
7
7 is the greatest prime factor of 84.
It is: 2^2*3*7 = 84
7
The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question! The greatest factor of any number, such as 84+16 = 90 is the number itself, ie 90.
42,2 21,2,2 7,3,2,2